Find the acceleration?

Question

Find the acceleration (in ft/sec^2) needed to bring a particle moving with a velocity of 75 ft/sec to a stop in 5 sec. 

 

Answer: -15

 

Please show all your work.

Answer 1

Final velocity =0

initial velocity = 75

acceleration = (initial velocity - final velocity) / time

time = 5

(75-0)/5 = 15